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Investment Securities (Tables)
 12 Months Ended
Sep. 30, 2012
Investment Securities [Abstract]  
Investments by contractual maturity date
September 30,
2012
 
Amortized
Cost
 
Gross Unrealized    
 
Fair
Value
 
Yield
Gains
 
Losses
 
 
(In thousands)
Available-for-sale securities
 
 
 
 
 
 
 
 
 
U.S. government and agency securities due
 
 
 
 
 
 
 
 
 
Within 1 year
$
19,999

 
$
42

 
$
(6
)
 
$
20,035

 
0.57
%
1 to 5 years
—

 
—

 
—

 
—

 
—

5 to 10 years
59,300

 
4,225

 
—

 
63,525

 
2.21
%
Over 10 years
100,000

 
—

 
—

 
100,000

 
1.05
%
Corporate bonds due

 

 

 

 

1 to 5 years
336,340

 
2,810

 
(61
)
 
339,089

 
0.91
%
5 to 10 years
62,919

 
1,324

 
(7
)
 
64,236

 
2.73
%
Municipal bonds due

 

 

 

 

  Over 10 years
20,442

 
4,402

 
—

 
24,844

 
6.45
%
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
1,161,668

 
9,358

 
(1,050
)
 
1,169,976

 
2.28
%
 
1,760,668

 
22,161

 
(1,124
)
 
1,781,705

 
1.99
%
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
Tax-exempt municipal bonds due
 
 
 
 
 
 
 
 
 
Within 1 year
795

 
7

 
—

 
802

 
5.80
%
1 to 5 years
—

 
—

 
—

 
—

 
—
%
5 to 10 years
—

 
—

 
—

 
—

 
—
%
Over 10 years
—

 
—

 
—

 
—

 
—
%
U.S. government and agency securities due

 

 

 

 

1 to 5 years
—

 
—

 
—

 
—

 
—
%
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
1,190,692

 
25,729

 
—

 
1,216,421

 
3.10
%
 
1,191,487

 
25,736

 
—

 
1,217,223

 
3.10
%
 
$
2,952,155

 
$
47,897

 
$
(1,124
)
 
$
2,998,928

 
2.44
%
 
 
 
 
 
 
 
 
 
 
September 30,
2011
 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Yield
 
Gains
 
Losses
 
 
(In thousands)
Available-for-sale securities
 
 
 
 
 
 
 
 
 
U.S. government and agency securities due
 
 
 
 
 
 
 
 
 
Within 1 year
$
500

 
$
34

 
$
—

 
$
534

 
4.00
%
1 to 5 years
—

 
—

 
—

 
—

 
—
%
5 to 10 years
9,300

 
4,547

 
—

 
13,847

 
10.38
%
Over 10 years
175,515

 
631

 
—

 
176,146

 
2.57
%
Corporate bonds due

 

 

 

 

1 to 5 years


 


 


 


 


5 to 10 years
30,000

 
284

 
(325
)
 
29,959

 
4.00
%
Municipal bonds due

 

 

 

 

  Over 10 years
20,461

 
3,107

 
—

 
23,568

 
6.45
%
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
2,883,734

 
127,356

 
—

 
3,011,090

 
4.72
%
 
3,119,510

 
135,959

 
(325
)
 
3,255,144

 
4.62
%
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
Tax-exempt municipal bonds due
 
 
 
 
 
 
 
 
 
Within 1 year


 


 


 


 
—
%
1 to 5 years
405

 
5

 
—

 
410

 
6.52
%
5 to 10 years
1,545

 
68

 
—

 
1,613

 
5.60
%
Over 10 years
—

 
—

 
—

 
—

 
—
%
U.S. government and agency securities due

 

 

 

 

1 to 5 years
—

 
—

 
—

 
—

 
—
%
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
45,086

 
3,507

 
—

 
48,593

 
5.31
%
 
47,036

 
3,580

 
—

 
50,616

 
5.33
%
 
$
3,166,546

 
$
139,539

 
$
(325
)
 
$
3,305,760

 
4.63
%

 
Schedule of unrealized losses and fair value of securities
The following table shows the unrealized gross losses and fair value of securities at September 30, 2012, by length of time that individual securities in each category have been in a continuous loss position. The Company had $10.0 million securities in a continuous loss position for 12 or more months at September 30, 2012, which consisted of mortgage-backed securities. Management believes that the declines in fair value of these investments are not an other than temporary impairment.
 
As of September 30,
2012
  
Less than 12 months
12 months or more
Total
  
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
 
(In thousands)
Corporate Bonds
$
(61
)
$
14,939

$
(7
)
$
9,994

$
(68
)
$
24,933

U.S. agency securities
(6
)
19,493

—

—

(6
)
19,493

Agency pass-through certificates
(1,050
)
201,749

—

—

(1,050
)
201,749

 
$
(1,117
)
$
236,181

$
(7
)
$
9,994

$
(1,124
)
$
246,175